<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>500</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/semantic-ui@2.4.2/dist/semantic.min.css">
    <style>
        .bg{
            width: 800px;
            height: 350px;
            background-image: url("https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimg.zcool.cn%2Fcommunity%2F0114c355e68f9932f875a132549a06.png%40900w_1l_2o_100sh.jpg&refer=http%3A%2F%2Fimg.zcool.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1641007123&t=a99b410da11b44e3d028240d7d2d285f");
            background-repeat: no-repeat;
            background-color: #334aff;
            margin-top: 80px;
            margin-left: auto;
            margin-right: auto;
            margin-bottom: 10px;
        }

    </style>
</head>
<body style="text-align: center">
    <div style="text-align: center">
        <div class="bg"></div>
        <button type="button" class="ui teal button" onclick="window.history.go(-1)">返回上一页</button>
    </div>

</body>
</html>